Dust-collector.



c. 11. THURMAN.

DUST COLLECTOR.

APPLIGATION FILED 00127, 1913.

1,109,372. I Patented 36 1111914.

2 SHEETS-SHEET 1.

gwmantoz V I V I alfornu G. R. THURMAN.

DUST COLLECTOR.

APPLICATION FILED 001*. '1, 1913.

. 1,109,372. Patented Sept. 1,1914.

2 SKEETSSHEET 2.

PI E

Witnesses anensions an enemas n rnunmanfor museums, BENQVATOR mncmorumne 00,, or,

, {'IION or PENNSYLVANIA.

mai man, .sssrenonl ru ELECTRIC; PI'B EPSBUBGE'. rmmsznvum, av conronA- a-Ieaaa Application filed' was; .1. 1952s 3 smnnmsassa:

To lZZZ'QUhOWb it may concern:-

- Be it known t at 1-, CHARLES R. Tum

MAN, ing at gheny and. State of Pennsylvania,

a specification.

My invention relates to vacuumcleaning machines and in particular to the dust col--- lecting receptacles used in connection there-- the invention being to dust collector of moderate di air filtering surface of large I accomplish by securingprovide in a area, whichobject within the receptacle a filtering means in the form of a bag, made of suitable fabric, of much greater length than the receptacle and forming a series of concentric pockets by folding said bag within and upon itself several times over suitable supports or stretching frames that maintain the folds of the bag in proper relation within the receptacle and prevent contact of two or more folds by suction during the operation of the machine and thus the lessening of its efficiency. The supporting frames are so arranged within the receptacle that the bag may be withdrawn to empty the collected material when the cover as a shorter bag without folds, and as easily replaced, the bag falling naturally into the proper folds upon returning it to the receptacle.

Another object of the invention is directed to the suction pipe which projects into the receptacle and extends some distance toward the lower end of the first pocket formed by the bottom of the filtering bag, within which pocket the heavier dirt is retained and only a relatively small quantity of the lighter dust passes I walls of the outer pockets which,

' reduction in of machines in the employment of a cylindrical shield to the folds or therefore, are unobstructed by a collection of dirt even when the inner pocket is nearly full of material. The pores of the filtering material never become so filled as to cause a rapid suction which is characteristic that use a short bag, and which is due to the filling of the bag with dirt whereby the area of efficient filtering sur face is lessened.

A further object of the invention resides a citizen of the United States, resid Pittsburgh, in the county of 1 'A-llehave in vented newand useful improvements in- Dust-Collectors, of-which the following is JnL-the accompanying drawing, Figure-I is an elevation "ofa -vacuum cleaner pro-f vided with a dust-collecting receptacle,--a-

is removed as easily withinthe winner pocket *fittingtightly agalnst the sides thereof near the bottom" only,-and eX-tendingupward nearly-to the top ofthe receptacles --By-'-the use ofthis shield the 'he'ayydirt will collecttherein leaving the walls-of the inner pocketfree' to serve as' additional filtering surfaces."

portionof which isbroken away to show its inner construction." Fig. -2-isan enlarged sectionalview through the dust colleetor to l lustratemore clearly certain features ofthe-inventionl- Figs. .3 and- 1 are perspective views of the stretcher frames for the filtering material. Fig. 5 is a sectional view of the dust collector showing the use of a shield to render the same more efficient. Figs. 6 and 7 are detail views illustrating modified forms of the inner stretching and separating frame.

. In the drawings 10 indicates a dust collector receptacle which in the present ina stance is shown mounted upon a suction fan 11 supported on a. base 12 carried by caster rollers 13 to permit free movement over the floor and containing an electric motor for drivingthe fan in well known manner.

The receptacle 10 as shown is cylindrical and made of sheet metal, the top of which is open but maybe closed air tight by. a cover 14 secured in place by spring clips 15. Within" the receptacle is a filtering material 16 in the form of a long bag made of a suitable fabric through which' air is drawn leaving any dust'containedin said air within the bag. The openend of the bag 16, which is directed upward, is fastened securely to a ring 17 preferably made of thin metal. and ;of angular horizontal member, 18 ofi'said ring being provided on each side with 'a gasket 01' packform in cross-section, the

ing 19 of some suitable Imaterial su'ch as 1 rubber and which when in positionlies be tween the top of the casing 10 and the cover l t and serves to form an air-tight closure the ring 17 and projecting downi for a wardly into the receptacle near the bottom thereof are a number of arms 21 which are attached at their lower ends to a ring 22 of less diameter than the ring 17 whereby the arms 21 incline toward the axis of the cylinder as they extend downwardly. These two rings form one of the stretching frames for the filtering material or bag.

Within the stretching frame as described, is a second stretching frame 23 extending from the bottom of the dust collector receptacle upon which it rests upwardly to about the plane of the ring 17. This stretching frame is made of wire gauze or other suitable perforated material, cylindrical in shape and of less diameter than the ring 22. This material may be of a single thickness asin Figs. 1 'and 5, or of two thicknesses slightly separated at 23 Fig. 6, purpose to be described hereinafter. Within the stretching frame 23 near its lower end is arranged a circular plate 24 spaced from the bottom of the receptacle and from the walls of the stretching frame 23, as shown at 25, to permit air passing from the receptacle into the fan. Brackets Y 26 are connected to the stretching frames and to the circular plate 24 to hold the frame in position. Posts 27 maintain the circular plate 24 rigid-with the bottom of the receptacle. 4

With the stretching frames arranged as described the filtering material -or bag extends from the ring 17 downward and around the ring 22, thence upward over the top of the stretching frame 23 and downward to the plate 24 upon which the closed end of thevbag rests. The proportions of.

the bag are such, and the. two stretching frames so spaced, that the folds of the bag or filtering material when in position are separated from one another and form two pockets 28 and 29, the pocket 28 being the innermost and serving to collect the heavy d irt.

Projecting outwardly fromthe cover 14 of the dust collector is a tubular connection 30 upon which is fitted the flexible hose of the cleaning tool, the bore of said connection passing into the cover and through a .hollow extension 31, projecting downwardly into the center of the pocket- 28 about midway between thetop and bottom thereof. By means of this pipe the dust laden air entering therethrough immedideposits the heavy dirt on the bottom of t e pocket 28 where it'is retainedby its weight and its distribution prevented, only the lighter particles passing up over the top .of the stretcher frame 23 and into the pocket 29 as the air makes its escape through the exposed walls of the filtering material.

To place the bag within the receptacle the cover 14 is removed and the rin 17 of the Baggripped by the hand so t at the similar to the folds in a bellows.

closed end hanging downward may pass within the perforated supporting frame 23 and rest uponthe bottom plate 24. As the ring 17 is lowered to rest upon the upper edge of the receptacle 10 the ring 22 forming the bottom of the outer supporting frame engages the bag and carries the cloth downward outside the perforated support 23 and draws it into neat folds without effort. These folds owing to the relative position of the rings 17 and 22 and the top of the frame 23 are separated one from the other in a zigzag arrangement somewhat The fold a. which forms the pocket 28 lies'within the perforated frame 23, the fold 6 lies between the frame 23 and outside stretching frame, while the fold c is outside the latter frame. The filtering surface exposed by 'a bag arranged as described is about three times what it would be with a simple bag and by forming the pockets 28 and 29 the former maybe substantially filled with dirt without interrupting the suction, as the walls 6 .andc of the outer pocket 29 are of sutficient area for'the passage of air to the suction fan 11. The bag itself cannot be drawn into the fan by the suction because of the perforated frame 23 and the bottom plate 24 which guard and support the lower free end of the bag. The frame 23 also prevents the folds a and b of the bag being drawn into intimate contact and thus interrupting the suction; through said folds.

The perforated material of the stretching frame 23 whether of single or double thickness forms a cellularseparator betweenthe folds through which air readily passes. Instead of making the separating frame of wire gauze or other perforated material, corrugated material 23? may be substituted there or as shown in Fig. 7. After the bag has been filled it may be withdrawn by removing the cover 14 and lifting the ring 17, the bag withdrawing from the receptacle as easily as a simple unfolded bag.

Airmixed with dirt drawn into the receptacle through the tube 31 flows to the bottom of the bag where its movement is reversed to pass out of the pocket 28 into the pocket 29. This reversal of movement of the air tends to throw the heavy particles, of dirt to the bottom of the bag 28 where they settle and only the lighter particles of dust rise through a space of large area in the upper part of the pocket 28, thus reducing the current'of air-and the speed of movement of the dust which finally passes over the upper edges of the supporting frame 23 into the pocket 29 where the fine particles of dust are deposited and the air escapes through the P0185 of the filtering wallsb and c.

If desired a shield 35 may be used in connection with the inner bag '28. This shield,

' frames over which said member automat1-. c'ally folds. when inserted in said receptacle means of--the shield dust laden air entering the receptacle through the tube 31 is prevented from depositing immediately upon the wall a of the pocket 28 but must .pass to and over the top of the shield where the three filtering walls a, b and c are exposed to separate the air from the fine dust. By means of this shield dirt may collect until the receptacle is full without appreciably affecting the filtering qualities of the walls of the bag, the shield keeping the collected dust away from the wall a.

I claim v 1. A dust collector comprising a receptacle, a cover for said receptacle, a bag shaped filtering member insertible in said receptacle, a supporting frame clamped between said cover and said receptacle and secured to the mouth of said filtering member, and a second supporting frame within said receptacle, said filtering member adapted to automatically fold over said frames when inserted in said receptacle toiform a plurality of upwardly opening dust coll ecting pockets and spaced concentric filtering walls, and which straightens out when removed from the receptacle to form a holder for the collected dirt.

2. A dust collector comprising a receptacle, a cover for said receptacle, a filtering bag insertible in said receptacle, a supporting frame removable with said bag comprising upper and lower rings and arms connecting the same disposed within the mouth of said bag, to the upper of which rings said bag is secured, said upper ring being supported from the upper edge of said receptacle and clamped thereon by said cover and a second supporting frame of lessdiameterthan the first frame made of perforated material secured within the receptacle, said bag adapted to fold over said frames when inserted in said receptacle to form a plurality ofupwardly opening dust collecting pockets and spaced concentric filtering walls.

3. A dust collector comprising a closed receptacle, a bag shaped filtering member insertible in said receptacle, supporting to form a plurality. of upwardly opening dust collecting pockets and spaced concentric filtering walls, and an air inlet tube projecting within and discharging adjacent the bottom wall of the innermost of said pockets.

4. A dust collector comprising a closed receptacle having a tight removable cover, a bag shaped filtering member insertible in said receptacle, supporting frames. over which said member automatically folds when inserted in said receptacle to form a plurality of upwardly opening dust collecting pockets and spaced concentric filtering walls, and an air inlet tube opening through said cover and projecting downwardly within and discharging adjacent the bottom wall of the innermost of said pockets.

5. A dust collector comprising a receptacle, a cover for said receptacle, a filtering bag insertible in said receptacle, a supporting frame within the mouth of said bag and secured thereto, said frame comprising an upper and a lower ring and arms connecting same, said upper ring having a horizontal supporting flange adapted to engage the upper edge of said receptacle, and to be clamped thereon by said cover, a packing carried by said flange, and a corrugated vertical flange to which the mouth of the bag is attached, a second supporting frame se cured within the receptacle made of perforated material, said bag adapted to auto matically fold over said frames when inserted in the receptacle to form a plurality of upwardly opening dust collecting pockets and spaced concentric filtering walls.

6. A dust collector comprising a closed receptacle having a tight removable cover, a filtering bag insertible in said receptacle, supporting frames over which said bag automatically folds when inserted in said receptacle to form a plurality of upwardly opening dust collecting pockets and spaced concentric filtering walls, and a cylindrical shield suspended from said cover insertible in the innermost pocket and adapted to contact with the wall thereof only near the bottom of said pocket.

7 A dust collector comprising a closed receptacle having a ti ht removable cover, a filtering bag insertible in said receptacle, supporting frames over which said bag automatically folds when inserted in said receptacle to form a plurality of upwardly opening dust collecting pockets and spaced concentric filtering walls, an air inlet tube opening through said cover and projecting downwardly and discharging into the innermost of said pockets, and a cylindrical shield suspended from said cover around the inlet tube and insertible in the innermost of said pockets contacting with the wall thereof only near the bottom of said pocket.

8. A dust collector comprising a receptacle, a cover for said receptacle, a filtering said receptacle and said cover, and a disbag insertible in said receptacle, a supportcharge tube depending from said cover and ing frame within the mouth of said bag projecting Within said bag. and secured thereto, said frame comprising In testimony 'Whereof I have hereunto set 15 5 an upper and a lower ring and arms conmy hand in presence of two subscribing Witnecting the same, said upper ring having a nesses. horizontal supporting flange and a corrugated vertical fiange engaging the mouth of CHARLES THURMAN said bag, a. packing engaging the opposite Witnesses: 10 sides of said supporting flange and adapted B. F. RICHARDS,

to be clamped between the upper edge of l E. ELLIOTT. 

